[ARDF] HB9CV dimensions? in PVC?

[Dale Hunt, WB6BYU]

Matt -

   Check W4RNL's web page (www.cebik.com).  In among all the
other antenna articles he has a number on the HB9CV and other
2-element phased arrays.  There is one version in particular
that I am thinking of trying for 2m (though he gives only 10m
dimensions, I can scale the element lengths.)

   I have two of the VK4BRG designs and the F/B is not as
good as I would like.  I've tried a couple mods, but not a
significant improvement so far.  (They are usable, but it
isn't always immediately apparent which is front and back.)

   While you are on the page, check the articles on the Moxon
rectangle.  I have two of them for 2m now, and they are quite
nice for DF.  Kuon used one last summer in Russia.  They are
about 30" wide and 11" long.  I used 3/4" flat aluminum stock
from the hardware store, which is probably more forgiving than
tubing or rod.  Not necessarily the best thing for running
through heavy brush because the closed ends can catch on
branches, but much easier to use for smaller folks.  The
biggest problem I have with these antennas is that they are
so short and light it is hard to find a place to mount the
receiver with good ergonomics, since the center of gravity
is always in the middle of the receiver.

    Meanwhile, I recently designed a 2-element yagi for some
CAP cadets, and got an email this evening that it (along with a
VK3YNG sniffer) took them right to an EPIRB in a marina
where others were having fits due to reflections.  A 2m version
of this would have a 40" driven element, 36.6" director, and 
6" spacing if built using 1" tape measure elements.  (Though for
beginners you might consider using #8 aluminum ground wire or
other simple material if they won't be busting brush as much.
(The wires can be straightened by hand when they get bent.)

    I also have a Mizuho with a built-in HB9CV using inductive
loading with link coils wound around them to which the phasing
line is attached.  I hope I never have to readjust it!


   Hope this gives you some good ideas.

       - Dale WB6BYU



Matthew Robbins wrote:
> 
> Does anyone have the dimensions (or a link) for a 2m HB9CV antenna?
> I've been looking, but most of the links are for HF antennas.  I've
> also found a link with the phasing section of the Czech Compact 144,
> but it doesn't have the complete element lengths:
> http://www.xs4all.nl/~pa0nhc/ardf/rx2/compact2/compact2.html
> 
> I'm thinking of making one with an H-shaped frame of PVC pipe holding
> the phasing lines, with tape measure material extending past the
> phasing line attachment points.  (Does that description make sense?)
> 
> Are there any trimmer components in these antennas?  I've seen some
> references that mention them, but no information past that.  Are there
> any technical descriptions of this antenna?  (Maybe I should check the
> ARRL antenna handbook...hmmmm.)
> 
> I'm trying to make a small, light antenna for kids.  (And if it works,
> maybe for me, too.)
> 
> Matthew
> AA9YH
> Cincinnati, Ohio USA
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